1 Canis Minoris
Star in the constellation Canis Minor
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1 Canis Minoris is a single[9] star in the equatorial constellation of Canis Minor, located about 287 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.37.[2] The radial velocity of this object is poorly constrained at −1.0±4.2 km/s.[2]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Canis Minor |
| Right ascension | 07h 24m 58.18002s[1] |
| Declination | +11° 40′ 10.2825″[1] |
| Apparent magnitude (V) | 5.37[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1][3] |
| Spectral type | A5 IV[4] or A4 V[5] |
| B−V color index | 0.105±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.0±4.2[2] km/s |
| Proper motion (μ) | RA: −15.574[1] mas/yr Dec.: −15.478[1] mas/yr |
| Parallax (π) | 10.9796±0.0959 mas[1] |
| Distance | 297 ± 3 ly (91.1 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.44[2] |
| Details | |
| Mass | 2.02[6] M☉ |
| Radius | 3.28[6] R☉ |
| Luminosity | 44[6] L☉ |
| Surface gravity (log g) | 3.71[6] cgs |
| Temperature | 8,222[6] K |
| Rotational velocity (v sin i) | 159[3] km/s |
| Age | 716[7] Myr |
| Other designations | |
| 1 CMi, BD+11°1578, GC 9891, HD 58187, HIP 35987, HR 2820, SAO 96871[8] | |
| Database references | |
| SIMBAD | data |
Cowley et al. (1969) listed a stellar classification of A5 IV[4] for 1 Canis Minoris, matching an A-type subgiant star that has exhausted the hydrogen at its core and is evolving into a giant. However, Gray and Garrison (1989) catalogued it as an A-type main-sequence star with a class of A4 V.[5] The Hipparcos team used a class of A3 Vn,[2] where the 'n' indicates "nebulous" lines due to rapid rotation.
This star is estimated to be 716 million years old[7] and is at or near the end of its main sequence lifetime.[3] It has a high rate of spin, showing a projected rotational velocity of 159 km/s.[3] The star has more than double the mass of the Sun with about 3.3 times the Sun's radius.[6] It is radiating 44 times the Sun's luminosity from its photosphere at an effective temperature of 8,222 K.[6]